Rollup merge of #110426 - calebcartwright:style-let-else-examples, r=compiler-errors

docs(style): add more let-else examples

Adding a few more examples for increased clarity based on subsequent discussion that arose after implementation work began.

Will need approval from t-style, but also cc ```@ytmimi``` to make sure these examples don't contradict any examples we've been incorporating as part of the rustfmt implementation

src/doc/style-guide/src/statements.md

@@ -138,6 +138,7 @@ Otherwise, the `else` keyword and opening brace should be placed on the next lin
 For example:
 
 ```rust
+fn main() {
     let Some(x) = abcdef()
         .foo(
             "abc",
@@ -149,7 +150,19 @@ let Some(x) = abcdef()
         .baz()
         .qux("fffffffffffffffff")
     else {
-    foo_bar()
+        return
+    };
+
+    let Some(x) = some_really_really_really_really_really_really_really_really_really_long_name
+    else {
+        return;
+    };
+
+    let Some(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) =
+        bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+    else {
+        return;
+    };
 }
 ```